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THE VIBRONIC SPECTRUM OF SELENOFORMALDEHYDE IN THE NEAR INFRARED
Richard H. Judge, Dennis J. Clouthier, D. C. Moule, Yves Gabriel Smeyers
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Abstract
The polymers of $CH_{2}Se$ and $CD_{2}Se$ were pyrolyzed at $700^{\\circ}C$ to yield monomeric selenoformaldehyde. Laser excitation spectra of these molecules were recorded. The origin of the weak singlet-singlet $\\tilde{A}^{1}A_{2} \\leftarrow \\tilde{X}^{1}A_{l}$ system in $CD_{2}Se$ was observed at $13631.5 cm^{-1}$ while that of $CH_{2}Sc$ has been calculated to be at $13.555 cm^{-1}$. The much more extensive and intense singlet-triplet a3A2 - X1Al systems of CH2Se/CD2Se have origins at $12171.0/12262.7 cm^{-1}$. A double minimum potential energy function was used to fit the triplet state $V_{4}$ inversion levels and was found to be similar to that observed for thioformaldehyde.